package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.springframework.aop.framework.AopContext;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;
    @Resource
    private RedisIdWorker redisIdWorker;
    @Override
    public Result seckillVoucher(Long voucherId) {
        SeckillVoucher seckillVoucher = seckillVoucherService.getById(voucherId);
        if (seckillVoucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀尚未开始");
        }
        if (seckillVoucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已经结束");
        }
        if (seckillVoucher.getStock() < 1) {
            return Result.fail("库存不足");
        }
        Long userId = UserHolder.getUser().getId();
        synchronized (userId.toString().intern()){
            // 通过AOP代理获取当前类的代理对象，确保事务生效
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            // 调用createVoucherOrder方法创建订单，该方法需要事务管理
            return proxy.createVoucherOrder(voucherId);
        }

    }

    @Transactional
    public  Result createVoucherOrder(Long voucherId) {
        Long userId = UserHolder.getUser().getId();
        synchronized (userId.toString().intern()){
            int count = this.query().eq("user_id", userId)
                    .eq("voucher_id", voucherId)
                    .count();
            if (count > 0) {
                return Result.fail("不能重复下单");
            }
            boolean success = seckillVoucherService.update()
                    .setSql("stock = stock - 1")
                    .eq("voucher_id", voucherId)
                    .gt("stock", 0)
                    .update();
            if (!success) {
                return Result.fail("库存不足");
            }
            VoucherOrder voucherOrder = new VoucherOrder();
            long orderId = redisIdWorker.nextId("order");
            voucherOrder.setId(orderId);
            voucherOrder.setUserId(userId);
            voucherOrder.setVoucherId(voucherId);
            save(voucherOrder);
            return Result.ok(orderId);
        }

    }
}
